Question

What power is needed to lift a 49-kg person a vertical distance of 5.0 m in 20.0 s?

a. 120 w
b. 25 w
c. 60w
d. 12.5

Answer 1

Answer:

12.5

Explanation:

Hope it is helpful to you

Answer 2

Answer:

Explanation:

Given :

• Mass (m) = 49 kg
• Height (h) = 5.0 m
• Time (t) = 20.0 s
• Acceleration due to gravity (g) = 9.8 m/s^2

To Find :

• Power is needed to lift a person.

Formula to be used :

• P = W/t

Solution :

★Power is needed to lift a person.

P = W/t

.°. P = mgh/t

⇒ P = 49 × 5.0 × 9.8/20.0

⇒ P = 49 × 49/20.0

⇒ P = 2401/20.0

⇒ P = 120.05 W

Hence, Power is needed to lift a person is 120.05 W.